121201111121 has 16 divisors (see below), whose sum is σ = 128598757248. Its totient is φ = 113982422400.

The previous prime is 121201111103. The next prime is 121201111123. The reversal of 121201111121 is 121111102121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201111096 and 121201111105.

It is not an unprimeable number, because it can be changed into a prime (121201111123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3519830 + ... + 3554096.

It is an arithmetic number, because the mean of its divisors is an integer number (8037422328).

Almost surely, 2^121201111121 is an apocalyptic number.

It is an amenable number.

121201111121 is a deficient number, since it is larger than the sum of its proper divisors (7397646127).

121201111121 is a wasteful number, since it uses less digits than its factorization.

121201111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36872.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121201111121 its reverse (121111102121), we get a palindrome (242312213242).

The spelling of 121201111121 in words is "one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred twenty-one".